Good call. I would also put it back.
It's just a flow restrictor that limits oil flow to the head so the bottom end still gets oiled sufficiently and also an anti-drain back to keep the oil passages in the head, cams and lifters filled up. Prevents lifter tick at start up. __________________
1996 Ti 280k miles and still going....
1993 964 - holding on to this one
2001 Burban, 240k miles
2018 Suburban Z71
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